<html lang="en">
<head>
    <meta charset="utf-8">
    <title>JavaScript</title>
</head>
<body>
    
</body>
<script type="text/javascript">
document.write("使用JavaScript脚本语言循环输出hello world!")
for(var i=0;i<5;i++){
    document.write("<h1>hello world！</h1>");
}
</script>
</html>